The recruit can come a bit late, login and logout. Also be sure that you’ve completed all the event missions required for the recruits. You can check the progressions level from the Event widget below the “Collect salary” button.
Last but not least, the event missions are marked with a different color, to separate them from normal missions.

Fear not! Most harem recruits will appear again under the form of different events! To learn more about events, please check out this article!

If you want to spend energy but already unlocked the last quest in the Adventure mode, you can spend energy by going on the Champions’ reception desk.